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About 10 years ago, I took several ceramic classes and fell in love with the way Strontium Crystal Magic worked with other glazes. I attached a picture of Strontium Crystal Magic Warm with a spray of Water Color Green that I made in a community college class.
Fast forward 10 years and I cannot get anything close to those results. The second picture shows the same glazes with a kiln controller set to a standard medium speed firing schedule to cone 5 with a 12 minute hold time. There are tons of nasty little pin-holes, and although I don't mind the color, it is nothing like I was expecting.
The recipe that I copied from San Juan College is as follows:
Strontium Crystal Magic
Custer Feldspar 2400
Whiting 900
Strontium Carb 660
6 Tile Kaolin 780
3124 Frit 240
Lithium Carb 240
Titanium Dioxide 720
Bentonite 120
Total: 6030
Yellow Iron Oxide 121 (2%)
Sooo... I noticed online that my SJC recipe has slightly different ratios than the one I found on https://ceramicartsnetwork.org/ceramic-recipes/mid-range/strontium-crystal-magic-warm/. Also, my copy from SJC says "6 tile kaolin" while the one on the website says EPK.
Is my recipe written wrong? or is my firing schedule and temperature causing the pin-holing and color difference between the pot 10 years ago and now? I know that glazes are super complicated, but I just don't even know where to start and would really appreciate some help.
Thank you for any help!
Erin
P.S. I am so sorry the images are huge... I wasn't sure how to re-size them